Cleaned up installation instructions for OS-X, added a link to the fink plplot package
Cleaned up installation instructions for OS-X, added a link to the fink plplot package

svn path=/trunk/; revision=6659

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot